Invalid_Viewstate - Please help!

[InnoCreate]

Hi Everyone,
Occasionally i'm getting the following error logged. I've heard this
can be caused by proxy servers. Does anyone know anyways to resolve the
issue or anything else that could cause the issue.

Thanks
James

[Error]

System.Web.HttpUnhandledException: Exception of type
System.Web.HttpUnhandledException was thrown. --->
System.Web.HttpException: Invalid_Viewstate
Client IP: 88.105.241.198
Port: 2352
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;
SV1; .NET CLR 1.1.4322)
ViewState:
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
Http-Referer:
http://www.homester.co.uk/(iuenpv55... home&OVKEY=sell your own home&OVMTC=standard
Path: /Index.aspx. ---> System.Web.HttpException:
Authentication of viewstate failed. 1) If this is a cluster, edit
<machineKey> configuration so all servers use the same validationKey
and validation algorithm. AutoGenerate cannot be used in a cluster.
2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted. --->
System.Web.HttpException: Unable to validate data.
at System.Web.Configuration.MachineKey.GetDecodedData(Byte[] buf,
Byte[] modifier, Int32 start, Int32 length, Int32& dataLength)
at System.Web.UI.LosFormatter.Deserialize(String input)
--- End of inner exception stack trace ---
at System.Web.UI.LosFormatter.Deserialize(String input)
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
--- End of inner exception stack trace ---
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
at System.Web.UI.Page.LoadPageViewState()
at System.Web.UI.Page.ProcessRequestMain()
--- End of inner exception stack trace ---
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain()
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously

 

[Guest]

InnoCreate,
A little bit too much info on this post. Next time change ip to 192.168.1.1

Yes this could be caused by a proxy server but you'd probably
also have errors like user A can see user b's web pages.

I sometimes get errors like this when developing and I change the page while
its
still running in another browser, when controls that are created on the fly
aren't
available on the server when the viewstate is checked by asp.net, when using
the
restart button in visual studio (thats same as still running in another
browser)

Look for someone making changes outside a move to production cycle
Look for someone debugging on the production server.
Look for controls that are created on the fly.

Good Luck
DWS

Hi Everyone,
Occasionally i'm getting the following error logged. I've heard this
can be caused by proxy servers. Does anyone know anyways to resolve the
issue or anything else that could cause the issue.

Thanks
James

[Error]

System.Web.HttpUnhandledException: Exception of type
System.Web.HttpUnhandledException was thrown. --->
System.Web.HttpException: Invalid_Viewstate
Client IP: 88.105.241.198
Port: 2352
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;
SV1; .NET CLR 1.1.4322)
ViewState:
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
Http-Referer:
http://www.homester.co.uk/(iuenpv55... home&OVKEY=sell your own home&OVMTC=standard
Path: /Index.aspx. ---> System.Web.HttpException:
Authentication of viewstate failed. 1) If this is a cluster, edit
<machineKey> configuration so all servers use the same validationKey
and validation algorithm. AutoGenerate cannot be used in a cluster.
2) Viewstate can only be posted back to the same page. 3) The
viewstate for this page might be corrupted. --->
System.Web.HttpException: Unable to validate data.
at System.Web.Configuration.MachineKey.GetDecodedData(Byte[] buf,
Byte[] modifier, Int32 start, Int32 length, Int32& dataLength)
at System.Web.UI.LosFormatter.Deserialize(String input)
--- End of inner exception stack trace ---
at System.Web.UI.LosFormatter.Deserialize(String input)
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
--- End of inner exception stack trace ---
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
at System.Web.UI.Page.LoadPageViewState()
at System.Web.UI.Page.ProcessRequestMain()
--- End of inner exception stack trace ---
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain()
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously